chris stevens and three other americans were killed in the attack. before last month's attack in benghazi special teams arrived throughout north africa. they were positioned to quickly strike a terrorist target or rescue a hostage. anonymous terrorism official said they were not ready to respond. u.s. and mexican authorities are searching for suspects in the border of a u.s. agent. nicholas ivie was responding to an alarm in a heavily trafficked drug corridor. it's the first fatal shooting of a border agent since 2010. authorities believe more than one person fired on the agents. >>> american airlines says improperly installed seat clamps is the reason why seats came loose. american is inspecting their seats. the clamps thafb incorrectly installed. four other planes have had the same problem. federal aviation officials are investigating. cbs money watch time on a wednesday. car sales shift into high gear and an iphone case that can take a licking. ashley morrison has more. good morning. >> good morning. investors overseas were cautious ahead of key m